These trans are not difficult to take apart, practice on the old one.

You could strip down the replacement just enough to change the K2 bushing and go from there. For parts you will need a K2 busing , a " paper and rubber kit " and maybe the output shaft seal if the 4 wd is different than the 2 wd.

These trans are built from the bell housing rearward rather than main case forward. In general you would unbolt the bell housing, place entire unit bell down, remove output flange then pull the main case off.

Next you would separate the input / output shafts and pull clutch drums / ring gears off the input shaft stack until you can change the bushing. You will also need to take the B1 housing / pump off the bell to change the gasket.

Given the bushing went X miles to failure, the new bushing should go another X miles.